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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbc572767818a03f10eeacf2da1f312dfa11452635263807f6ede72f7c753a1e' 
  AND token = '2PWM2/6INf6b6pZch9IbedKHq2kL5OuFfDMTlfMs8Zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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