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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c454f4861a4ae52dea1301557fc9a512b22fd03d96d7419e4a599709c9e2a0c' 
  AND token = 'R3phLy99MceecF9r8u7khqvz1O8nAF/iSez/0q+a0qw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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