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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0da2ff8bb4a877fd63e8d0dcfe5585bbcdf7611ec0ff1ad2d34d94d27c4bcad' 
  AND token = 'P0yxhXnFOvF1UybeaR4G61x/1FpYP1U/nYOj2fKUoLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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