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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fb6e98f23b5235780d77f6c6744b8b3dac0ac32680ac53b52c584129b535503' 
  AND token = 'OZ9L7wU0ztHk4YdR6lJs7F+82qY50Ds4tayRSbNUNjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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