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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca51f57b45b7047b692ef5549208e2ea2fc30f093934c62206bd9c65f19c1c06' 
  AND token = 'x3pd3IELev+q7JOycLZxoW3infOBVZCOp1StwyJ5q7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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