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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6365088dfa0b06e97a3bad0005d137d14d4e2a0cba86bab7acff370e85bd5955' 
  AND token = '16Oi/yve1vLXPgZzT8VXLaxheHF3GvTiKBMHWELB1gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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