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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5cca9623698bb9924600ee7600b6fbf3759bc8ab87e5b1bffcd926acd8a1ae7' 
  AND token = 'SSa/NLaJPHPhENBCvfI0GIh62J6R4c6r+etdHNu4n9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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