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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ac57639e55b03b8016a44655bc149ee2c1749b9aeafa461fc5213d4d17c7a7a' 
  AND token = 'SYjYJzU8+itgXDatGHYsr5Vo+N4S09ivmxZcN9/QusM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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