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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6a8785c11230dbac00449ab85259ad03568d22559621ea5c56a64c21884d27b' 
  AND token = '7EAflcwKldqXccPS144hxIb0gP5qNx98hlZiHmdIs+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}