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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da3e9763535a9da24140196605e891d13f7bce4fcec05931c9ffa35c27699c53' 
  AND token = 'NyYvYyr8S7LIuxpoMGN4P6NPYUByLbm0PXAaaJGx0Nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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