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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3370f9c7e9a6921eb2712363a38262738f878276cd0fa6740fa651fd52f4dc0' 
  AND token = 'ombG7DGZ4TGjETg6L/3YxDifCmyLA04ZJSO8QU1+yjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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