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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcab9d3057002b1c6e4af60a5bd5ad6f56efa8a9772d113dd435eea4c6c1f3e1' 
  AND token = 'B6Hk2e8XimQ5xChl5I6PEq6RDuhVKV4WT2V89+KqD04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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