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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29fbf7ef192999fc827aa560953265343fbb36220226db82383f230815e898f7' 
  AND token = 'GqSWFdGy9lyP9Hau3jT1L8lKZs7E4Zqn+g+H4EM4uT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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