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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '589953d295c78681f0dab4f038122ced96ccf988158a61e92d91266c499d9e55' 
  AND token = 'Pu5kJ8E3Z+DnLLMeAFpQbId5BONKhgKdEcEg36L8x14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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