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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f11acc719d00dad4d54b2be431da2bae583fea4580848bccb6770b91a861aa07' 
  AND token = '8XAVOZ5GltUn3mrRurtlAQu3/evYIRkwvl9WSHc7too=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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