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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '996eb0a6ecdee643bd42f212bea10898dc34a306af8f31a8d204c8f20da91c51' 
  AND token = 'I4J0F2xWtTksFx+GX7Z+BvwnxWXfx6fEcEuDXT3HeYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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