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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2da0cd7a1d662a31c4f95a4469d325e9bd8ad40f3a0a15f817879334e2389fc7' 
  AND token = 'ry5yVtno2e53xufLIpttnuQBVgS6FTeFIGPV5MQRTQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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