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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b5ce5792244c0f5feb2d027d3046b4db0482ca4e3676f7d7f1e813e5212d1e2' 
  AND token = 'rVMSEuDeowiuDLFPz5uOGhQ/SRpxKBm007OBSRa6R7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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