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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0decc189ed1849cb478e2527e1b140038567e3115e9d16c02ab0851754aabf2' 
  AND token = 'Yu+Lv3OoiE3H0OYi7J/ixtfYJCJLJmBnM3C462z2s2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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