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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6b4766679d4de0cd56d0016cb6e4c77dbb108fc704dab5e2f46daa1bff0eda1' 
  AND token = 'G10dTzeVo3Lf9tLk/PD6llrGR6pvqmfhvYuag9isEeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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