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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19dedd98bd8bded3b2f954d2783e056ab48510e1414bc2242c5df76b625b1e03' 
  AND token = 'sNETH55O0ECgFbvx2ZgTbwU8KWP2qQIz1BlP3tH0JtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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