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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c563baafbb7788e798dc2b1c01583a95457e3d22fd6c491d997d6c64e202ed7' 
  AND token = 'aHbS3LnGbd31CF5ZMW88lqgs01cXYrzY5RhRMZlrYXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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