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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e40113a67644c5f0f0e1af729c1a28079d833d604c9ee59664712467d81b2d2' 
  AND token = 'a6A4ReCLuRJlIam7oMMtu1U13BHRHbK8UMQBONv9FyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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