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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6991f84d37383bc8b42bad6096da4941a80a114e42adc324addc2b497bff398c' 
  AND token = 'CdTd6b3ghktbFGGab7HZpMtQ2bqUL03DW0+CNalwYkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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