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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '585096d3d99937877ec55f8337d0a6f83b6ebb38f5de4db99f1f57c5fbcd42b8' 
  AND token = 'DMjqoLFQ8kMNn3nwROqzE/5NeFdWwEbcDmajdj8zTYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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