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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5d6777309b23c0bca8edc0a96755e55d409fcf1bb4e16878a1a357fb6524db0' 
  AND token = 'U/RKj+8SGDbsk3eN12zhNsO+I9u5Qe/4zouOSaUaoAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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