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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfa53e0ce3aba125390e6526efd1840793066453ad3b9f4bcfef8742c917b936' 
  AND token = '8ESMY0b6xNyc8nm3UHs4Mgw/WZMBPk/Bafd8HSH2384=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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