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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00ab2edd8a5e303a88e69867ca8ceb9887188083700c0ac4690bc50bcdb02a52' 
  AND token = 'C4t7hMupsU327uAuXbDAk7g1DC/fg938b9c0h8Ostbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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