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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '631f3f08f5d5f64292deb7c61b6d682a10936d861eb158e2d2661f3507566131' 
  AND token = 'Oc7G28PkYnMpVtTWw0vU4vQNDXR4ift+d2XWhC0VHTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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