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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a2a35f4c2184dcd5b9839f1f6f1568fe60a02e552388fc7d57089cb0be86817' 
  AND token = 'xp3iJ0PrHv18g3wQM4Z8asuiurkPV1rIRCDi/TyzMUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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