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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8ad2cefb7afb1a141b8d3476de347845eff66ca22491a428763070fbb9344ef' 
  AND token = 'czSf812msee1158j/bew8AJzniHoyD/wLyAy00gQf1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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