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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '511c2eda4e1678558bc4a4836911a27cb5b496a7880ce0bf2db87a4d458e3ec6' 
  AND token = 'mPm2t7KEuN2nj++ljTDiuv7sm22Fq4rpSiL6661tQ2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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