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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6a09cf94a6878a20555c4a0b1d53d322c940407347531b5819b633a669e198d' 
  AND token = 'cVD/5ywi/+tZj9IcSYdHkhPYj89dIgFEdXnj92kVauQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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