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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '875893b5b8d3a7fa91a6066e4d6dd2263cff3e87b1057be10d5d04af4a5f6caf' 
  AND token = '74z0ZFtSu40/aCqyt/XzqLxHeOuR6zwEd//LnVIp6NE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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