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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3beb283a45abe4c224a45402904f6c2b384b2b700dbb3690e9dd8312eba8c57' 
  AND token = 'fvogV47pg1HsQ5214UkSM4P3c+5JWIuMVjVClwlpLGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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