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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7df5fa714e1723827f545d752fcbdd6a8a7f18f849f175209e1e496270da5cc' 
  AND token = 'T/q8MzSwch0diLhtPzX0ETzuiu1l1YLuJbqydMo2FM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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