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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1baaf09a343ed69576f0120ff0eb801a7f251dac48488dc029f7af5d75f716d1' 
  AND token = 'R+mR9JGAc3aVjvXlx9LUGrU9zx7dYC3K0knMJQM2aT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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