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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08436a043a9c7ea4b2d7fcbf461cb88ac90297fe16c158b4b2f39246e1065a90' 
  AND token = 'ii02V6izg8Wu5mA54yYwJUOm2Ua5BVMV3yxQ0iOEBxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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