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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f4ab27903b910cddc85593ce3e45942f0020be475489d4927c888bd8579b6fe' 
  AND token = 'pN2f4aKMX+xAJd/GF6j0o8/HhX1PNwadM8se8x7el3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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