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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e87775f0f8e09adcb7534e96b98d97eab322c7d7e0115417ac622f72637119c7' 
  AND token = 'R1U/yXCXcudaVc79Cf3CKieyOorJOxYfePH7HqvP1c8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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