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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1c8d646449458bc4bad0c4c9cacfda0fdd07a0a37cf79bd8e8d32c81446fe94' 
  AND token = '9o3aKqYW5U6zW0uVIey57VQpw/dTrlfTbyqTSZbobg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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