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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1738eda0111379db165af2d7b2686b05e74295c9968d13b14756c75f2b29bac' 
  AND token = 'rN/4jakvbLcjNze8VaSBXDoOioE/TtoHd6QC17mk+JM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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