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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f4c3c2145cd3c8b358e97994d07b11a50068e5c74c6e17f4a3eb2f040810f32' 
  AND token = 'utkG7U/wfoSm+67LHyNuSSqS+6vzkXexzwEaCyIANTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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