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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e0b7a90d71772d4b795a775ea9e5cd35c352f953a69edcd9c211d7a3f73fec4' 
  AND token = 'ggeG/653NvoykJ2t1XFSlVPMiodJIxEjX75klb3rpeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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