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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98a7720c8d6a9524b92f4164c237921ab2e7bb25dee1c512b2070e6d3ef7efea' 
  AND token = 'wq91sS+XsydQGr25kSUeh8GTF+rBqk+msevwrOd5jDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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