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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e25a47025d5b8a33f108224097724eba676caebfd3822d54d04ce11a14a0620d' 
  AND token = 'xEDP1NI9mCdP9yJFGx5PzAx3FzrY0UGNEsGQqW8tOJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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