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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff833db8f8251c52315d97d837dfd4589a004dad205b507bb168093bf30450a5' 
  AND token = 'UUo5JhH222OGNuTEIpD+Yo/zp280xJpfqD4SGqd/6M4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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