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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74ef133aa123ecc8ffc14950dfed633ff6fad07e752fe3e870de84737edb462b' 
  AND token = 'Q1sAkbbHFeiZJtMBAQmNDU2iGw0ng5Z6bdn3P4j1//c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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