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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e8f0abba0343e2abe5d90f56f32885fdd970069094ace5c8ee97d12b6e45215' 
  AND token = 'eBhHyVAOv1VBwTc0bZHGPK0o3AJl4SV/mz2aEaMVWK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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