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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28ea76c361ca38071d6766179a8ee41c00ab9ca197de3a20f493d68f96ae1efc' 
  AND token = 't/9/xq1M/RnJq0fBSM+k8iN9M17OTtCwD+5k2bJnvUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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