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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd877118e70b21514a343fdf3e9435027885e6baaab620d32622501170f5d5b2b' 
  AND token = 'dB23coE9+J+Rz3wZW29BaqNtn+Jd3/v2uDgSweU+UBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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