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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f92f2b5410a00375fff3054cec6282e4e77184f90f21df2afdab696802a69e5' 
  AND token = 'aERwECnwF8KaXVdQenvXgpEz7aaDk1wmZskexOrOFN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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