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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '770df1084cf66f6d07c06b8ded867a04e932e8e4f617db136428a3035d4422c4' 
  AND token = '+bs13+WK2QFFqJSK1j42Sm9nLiQauaqLhi2hyl/k4es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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