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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e17de8979ea718b368bf6ff9f27fe4b74490c949e2f6928a11e3ab71ed6b260' 
  AND token = 'fEESEdKWsYKYXLuUPI4Q/KY8XccjrKAwGGwSm+QZXU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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