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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0af4ad7634468d69dcb8345043b7f5668513ce26fcdb40ced55669551f9bd8d' 
  AND token = '3Ei3VOaYATHAGQAG/txbjm4/CIB0UwankQ22zzoI0Nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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