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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3697c4e4dda10e5d0aaa4e1bdcf49c34dbf2a836d9eea3f2ae094d944e667e5' 
  AND token = '8jfl3dPgl4cJIgUCgrhdLbuCH+tqXjvCnmijqr+Dx7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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