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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffa393d1ebf1c9e17124d5a576d6612e27574e90ae1eb542fab1d1adf93f3a9b' 
  AND token = 'R06i8k5J+5JXJX4Ou48M2mmLAOMHcMTkHd9TB/vjzNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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