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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f9bf6d9ee38b8eb1655e5e31547715858f263dd4e9ec06ecc361a721be671b0' 
  AND token = 'OFDjYrYjMfS0Su6Jp+MXGelrrYa3+5y0fMlBYHMZltQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00227

JSON explain

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